Touch Display Device Integrating Common Electrodes
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Solution Overview
Problem
Touch display devices with integrated touch sensors face challenges in reducing thickness and manufacturing cost while maintaining functionality.
Innovation Solution
The design includes a touch display device structure with a first substrate, active layer, gate insulation film, gate electrode, inter-layer insulation film, pixel electrode, protection layers, and electrodes connected through specific contact holes, allowing for a thinner and cost-effective manufacturing process by integrating common electrodes within the touch sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor is integrated into the display device, then touch sensing functionality is provided, but the thickness and manufacturing cost increase
Solution Approach 1:
The touch sensor electrodes are integrated with the display device electrodes by sharing common electrodes. The first and second electrodes serve dual purposes: as touch sensing electrodes and as display device electrodes, eliminating the need for separate touch sensor electrode layers and reducing overall device thickness.
Solution Approach 2:
The first and second electrodes perform multiple functions: they act as touch sensing electrodes for detecting touch input and as functional electrodes for the display device operation. This multi-functionality reduces the number of required electrode layers and simplifies the overall structure.
2Adaptability or versatility
If a touch sensor is integrated into the display device, then touch sensing functionality is provided, but manufacturing cost increases
Solution Approach 1:
The manufacturing process merges the touch sensor electrode formation with the display device electrode formation steps. By using the same electrodes for both touch sensing and display functions, the number of deposition and patterning steps is reduced, lowering manufacturing complexity and cost.
Solution Approach 2:
The first and second electrodes serve dual purposes as both touch sensing electrodes and display device electrodes, eliminating the need for additional touch-specific electrode layers. This reduces material costs and manufacturing process steps.
3Adaptability or versatility
If additional electrodes are added for touch sensing, then touch sensing capability is enhanced, but device complexity increases
Solution Approach 1:
The touch sensing function is merged with the existing display device electrode structure. The first and second electrodes are shared between touch sensing and display functions, avoiding the addition of separate touch sensor electrode layers and reducing structural complexity.
Solution Approach 2:
The electrodes are designed to perform multiple functions simultaneously - serving as both touch sensing elements and display device electrodes. This multi-functionality approach reduces the total number of components and simplifies the overall device architecture.
Data Source
AI summary
A touch display device includes a first substrate, an active layer disposed on the first substrate, a gate insulation film disposed on the first substrate with the active layer disposed thereon, a gate electrode disposed at a position overlapping with the active layer, an inter-layer insulation film disposed on the gate insulation film with the gate electrode disposed thereon, a pixel electrode disposed on the inter-layer insulation film, a first protection layer disposed on the inter-layer insulation film with the pixel electrode disposed thereon, a first electrode disposed on the first protection layer and connected to the active layer through a first contact hole, and a second electrode disposed on the inter-layer insulation film, connected to the active layer through a second contact hole, and connected to the pixel electrode through a third contact hole.